The term 'NOOK and Cranny' is a phrase used to describe something that is very thorough or complete. It is often used to describe a place that has been thoroughly searched or examined. The term is derived from the Old English word 'nok' which means corner or NOOK, and the Middle English word 'crannye' which means corner or crevice. The term is often used in the context of searching for something that may be hidden or hard to find.